<html><body><img id="planets"src="/i/eg_planets.jpg" usemap="#planetmap" /><map name="planetmap"><area id="venus" shape="circle"coords="180,139,14"href ="/example/html/venus.html"target ="_blank"title="Venus" /></map></map><p>Venus 的 title（即把鼠标移动到火星上显示的文本）是：<script type="text/javascript">x=document.getElementById('venus')document.write(x.title)</script></p></body></html>